Typically Geometry. But it depends on your level.
42 divided by 3 is 14
42 over 3 is a whole number of 14
A =

bh Multiply both sides by 2 to cancel out the fraction
2A = bh Divide both sides by b

= h Switch the sides to make it easier to read
<span>
h =
</span>
252 will most likely support it because if you simplify 30 over 50 then u get 3 over 5, then 5 divided by 420 is 84. If you multiply 84 by 3 then you get 252